/*! 
* WeX5 v3 (htttp://www.justep.com) 
* Copyright 2015 Justep, Inc.
* Licensed under Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0) 
*/ 
define(function(require) {
	var MD5 = function(hexcase) {
		this.hexcase = !hexcase?0:1; /* hex output format. 0 - lowercase; 1 - uppercase */
		this.b64pad = ""; /* base-64 pad character. "=" for strict RFC compliance */
		this.chrsz = 8; /* bits per input character. 8 - ASCII; 16 - Unicode */
	};
	
	/* 
	 * These are the functions you'll usually want to call 
	 * They take string arguments and return either hex or base-64 encoded strings 
	 */
	MD5.prototype.hex_md5 = function(s) {
		return this.binl2hex(this.core_md5(this.str2binl(s), s.length * this.chrsz));
	};
	
	MD5.prototype.b64_md5 = function(s) {
		return this.binl2b64(this.core_md5(this.str2binl(s), s.length * this.chrsz));
	};
	
	MD5.prototype.hex_hmac_md5 = function(key, data) {
		return this.binl2hex(this.core_hmac_md5(key, data));
	};
	
	MD5.prototype.b64_hmac_md5 = function(key, data) {
		return this.binl2b64(this.core_hmac_md5(key, data));
	};
	
	/* Backwards compatibility - same as hex_md5() */
	MD5.prototype.calcMD5 = function(s){
		return this.binl2hex(this.core_md5(this.str2binl(s), s.length * this.chrsz));
	};
	
	MD5.prototype.core_md5 = function(x, len) {
		/* append padding */
		x[len >> 5] |= 0x80 << ((len) % 32);
		x[(((len + 64) >>> 9) << 4) + 14] = len;
		
		var a = 1732584193;
		var b = -271733879;
		var c = -1732584194;
		var d = 271733878;
		
		for (var i = 0; i < x.length; i += 16) {
			var olda = a;
			var oldb = b;
			var oldc = c;
			var oldd = d;
			
			a = this.md5_ff(a, b, c, d, x[i + 0], 7, -680876936);
			d = this.md5_ff(d, a, b, c, x[i + 1], 12, -389564586);
			c = this.md5_ff(c, d, a, b, x[i + 2], 17, 606105819);
			b = this.md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);
			a = this.md5_ff(a, b, c, d, x[i + 4], 7, -176418897);
			d = this.md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);
			c = this.md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);
			b = this.md5_ff(b, c, d, a, x[i + 7], 22, -45705983);
			a = this.md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);
			d = this.md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);
			c = this.md5_ff(c, d, a, b, x[i + 10], 17, -42063);
			b = this.md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);
			a = this.md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);
			d = this.md5_ff(d, a, b, c, x[i + 13], 12, -40341101);
			c = this.md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);
			b = this.md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);
			
			a = this.md5_gg(a, b, c, d, x[i + 1], 5, -165796510);
			d = this.md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);
			c = this.md5_gg(c, d, a, b, x[i + 11], 14, 643717713);
			b = this.md5_gg(b, c, d, a, x[i + 0], 20, -373897302);
			a = this.md5_gg(a, b, c, d, x[i + 5], 5, -701558691);
			d = this.md5_gg(d, a, b, c, x[i + 10], 9, 38016083);
			c = this.md5_gg(c, d, a, b, x[i + 15], 14, -660478335);
			b = this.md5_gg(b, c, d, a, x[i + 4], 20, -405537848);
			a = this.md5_gg(a, b, c, d, x[i + 9], 5, 568446438);
			d = this.md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);
			c = this.md5_gg(c, d, a, b, x[i + 3], 14, -187363961);
			b = this.md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);
			a = this.md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);
			d = this.md5_gg(d, a, b, c, x[i + 2], 9, -51403784);
			c = this.md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);
			b = this.md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);
			
			a = this.md5_hh(a, b, c, d, x[i + 5], 4, -378558);
			d = this.md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);
			c = this.md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);
			b = this.md5_hh(b, c, d, a, x[i + 14], 23, -35309556);
			a = this.md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);
			d = this.md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);
			c = this.md5_hh(c, d, a, b, x[i + 7], 16, -155497632);
			b = this.md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);
			a = this.md5_hh(a, b, c, d, x[i + 13], 4, 681279174);
			d = this.md5_hh(d, a, b, c, x[i + 0], 11, -358537222);
			c = this.md5_hh(c, d, a, b, x[i + 3], 16, -722521979);
			b = this.md5_hh(b, c, d, a, x[i + 6], 23, 76029189);
			a = this.md5_hh(a, b, c, d, x[i + 9], 4, -640364487);
			d = this.md5_hh(d, a, b, c, x[i + 12], 11, -421815835);
			c = this.md5_hh(c, d, a, b, x[i + 15], 16, 530742520);
			b = this.md5_hh(b, c, d, a, x[i + 2], 23, -995338651);
			
			a = this.md5_ii(a, b, c, d, x[i + 0], 6, -198630844);
			d = this.md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);
			c = this.md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);
			b = this.md5_ii(b, c, d, a, x[i + 5], 21, -57434055);
			a = this.md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);
			d = this.md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);
			c = this.md5_ii(c, d, a, b, x[i + 10], 15, -1051523);
			b = this.md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);
			a = this.md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);
			d = this.md5_ii(d, a, b, c, x[i + 15], 10, -30611744);
			c = this.md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);
			b = this.md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);
			a = this.md5_ii(a, b, c, d, x[i + 4], 6, -145523070);
			d = this.md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);
			c = this.md5_ii(c, d, a, b, x[i + 2], 15, 718787259);
			b = this.md5_ii(b, c, d, a, x[i + 9], 21, -343485551);
			
			a = this.safe_add(a, olda);
			b = this.safe_add(b, oldb);
			c = this.safe_add(c, oldc);
			d = this.safe_add(d, oldd);
		}
		return Array(a, b, c, d);
		
	};
	
	/* 
	 * These functions implement the four basic operations the algorithm uses. 
	 */
	MD5.prototype.md5_cmn = function(q, a, b, x, s, t) {
		return this.safe_add(this.bit_rol(this.safe_add(this.safe_add(a, q), this.safe_add(x, t)), s), b);
	};
	MD5.prototype.md5_ff = function(a, b, c, d, x, s, t) {
		return this.md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
	};
	MD5.prototype.md5_gg = function(a, b, c, d, x, s, t) {
		return this.md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
	};
	MD5.prototype.md5_hh = function (a, b, c, d, x, s, t) {
		return this.md5_cmn(b ^ c ^ d, a, b, x, s, t);
	};
	MD5.prototype.md5_ii = function (a, b, c, d, x, s, t) {
		return this.md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
	};
	
	/* 
	 * Calculate the HMAC-MD5, of a key and some data 
	 */
	MD5.prototype.core_hmac_md5 = function (key, data) {
		var bkey = this.str2binl(key);
		if (bkey.length > 16)
			bkey = this.core_md5(bkey, key.length * this.chrsz);
		
		var ipad = Array(16), opad = Array(16);
		for (var i = 0; i < 16; i++) {
			ipad[i] = bkey[i] ^ 0x36363636;
			opad[i] = bkey[i] ^ 0x5C5C5C5C;
		}
		
		var hash = this.core_md5(ipad.concat(this.str2binl(data)), 512 + data.length * this.chrsz);
		return this.core_md5(opad.concat(hash), 512 + 128);
	};
	
	/* 
	 * Add integers, wrapping at 2^32. This uses 16-bit operations internally 
	 * to work around bugs in some JS interpreters. 
	 */
	MD5.prototype.safe_add = function (x, y) {
		var lsw = (x & 0xFFFF) + (y & 0xFFFF);
		var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
		return (msw << 16) | (lsw & 0xFFFF);
	};
	
	/* 
	 * Bitwise rotate a 32-bit number to the left. 
	 */
	MD5.prototype.bit_rol = function (num, cnt) {
		return (num << cnt) | (num >>> (32 - cnt));
	};
	
	/* 
	 * Convert a string to an array of little-endian words 
	 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored. 
	 */
	MD5.prototype.str2binl = function (str) {
		var bin = Array();
		var mask = (1 << this.chrsz) - 1;
		for (var i = 0; i < str.length * this.chrsz; i += this.chrsz)
			bin[i >> 5] |= (str.charCodeAt(i / this.chrsz) & mask) << (i % 32);
		return bin;
	};
	
	/* 
	 * Convert an array of little-endian words to a hex string. 
	 */
	MD5.prototype.binl2hex = function (binarray) {
		var hex_tab = this.hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
		var str = "";
		for (var i = 0; i < binarray.length * 4; i++) {
			str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF)
			+ hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF);
		}
		return str;
	};
	
	/* 
	 * Convert an array of little-endian words to a base-64 string 
	 */
	MD5.prototype.binl2b64 = function (binarray) {
		var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
		var str = "";
		for (var i = 0; i < binarray.length * 4; i += 3) {
			var triplet = (((binarray[i >> 2] >> 8 * (i % 4)) & 0xFF) << 16)
			| (((binarray[i + 1 >> 2] >> 8 * ((i + 1) % 4)) & 0xFF) << 8)
			| ((binarray[i + 2 >> 2] >> 8 * ((i + 2) % 4)) & 0xFF);
			for (var j = 0; j < 4; j++) {
				if (i * 8 + j * 6 > binarray.length * 32)
					str += this.b64pad;
				else
					str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F);
			}
		}
		return str;
	};
	return MD5;
});
